Iranian President Hassan Rouhani attends a meeting with Muslim leaders and scholars in Hyderabad, India, February 15, 2018.
On Tuesday, President Hassan Rouhani warned the United States president to remain in the nuclear deal Tehran signed with world powers in 2015 as other signatories stepped up efforts to save the agreement.
"According to the NPT, the (contracting) countries can easily withdraw from the treaty if they realize that it does not benefit them and this is a possible option for the Islamic Republic of Iran", said Ali Shamkhani, secretary of Iran's Supreme National Security Council.
In a statement on January 12, Trump gave Europeans only 120 days to agree to an overhaul of the nuclear agreement and said if the text of the deal is not revised he would unilaterally withdraw the USA from it.
Delegates from Britain, Sweden and other countries said that a U.S. withdrawal from the accord would have a serious impact on the global efforts for nuclear disarmament and non-proliferation.
The objective of the NPT, which took effect in 1970, is to halt the spread of nuclear weapons-making capability, guarantee the right of all members to develop nuclear energy for peaceful ends.
The United States, which holds one of the world's largest nuclear arsenals, also warned the conference that the prospects for progress on disarmament was now "bleak".
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North Korea's nuclear programme was one reason why "the non-proliferation regime today faces great threats", he said, also pointing to Iran's nuclear programme.
"I am telling those in the White House that if they do not live up to their commitments.the Iranian government will firmly react", Rouhani said in a speech.
President Donald Trump's administration has for instance recently made a decision to upgrade the USA nuclear weapons arsenal and to complement massive "strategic" bombs with smaller "tactical" weapons, in a move critics say would make them easier to use.
Under the nuclear deal, Iran is obliged to lower its nuclear program in exchange for termination of economic and financial sanctions.